<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
    <style>
      *{
        margin:0;
        padding:0;
        border:none;
      }
      .all{
        height:100vh;
      }
      .head{
		height:5vh;
        background: rgb(200,100,100);
        width:100%;

      }
      .footer{
		height:5vh;
        background: rgb(200,100,100);
        width:100%;
		
      }
	  .content{
		  overflow-y:scroll;
		  height:90vh;
	  }
	  .neirong{
		  height:500vh;
	  }
    </style>
	</head>
	<body>
    <div class="all"><div class="head">头部</div><div class="content"><div class="neirong">主体内容</div></div><div class="footer">尾部</div></div>
	</body>
</html>
